Fix sse calling bug

tests/tests2/109_sse_calling.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+struct Point {
+   float x;
+   float y;
+};
+
+struct Rect {
+   struct Point top_left;
+   struct Point size;
+};
+
+float foo(struct Point p, struct Rect r) {
+   return r.size.x;
+}
+
+int main(int argc, char **argv) {
+   struct Point p = {1, 2};
+   struct Rect r = {{3, 4}, {5, 6}};
+   printf("%f\n", foo(p, r));
+   return 0;
+}

tests/tests2/109_sse_calling.expect

@@ -0,0 +1 @@
+5.000000

x86_64-gen.c

@@ -1351,12 +1351,12 @@ void gfunc_call(int nb_args)
                 sse_reg -= 2;
                 gv(RC_FRET); /* Use pair load into xmm0 & xmm1 */
                 if (sse_reg) { /* avoid redundant movaps %xmm0, %xmm0 */
-                    /* movaps %xmm0, %xmmN */
-                    o(0x280f);
-                    o(0xc0 + (sse_reg << 3));
                     /* movaps %xmm1, %xmmN */
                     o(0x280f);
                     o(0xc1 + ((sse_reg+1) << 3));
+                    /* movaps %xmm0, %xmmN */
+                    o(0x280f);
+                    o(0xc0 + (sse_reg << 3));
                 }
             } else {
                 assert(reg_count == 1);